Refactor: enhance graphrag - part 2 (#14972)

### What problem does this PR solve?
1. expose batch_chunk_token_size for configuration
2. retrieve chunks when build subgraph for the doc, not retreive all
docs chunks at the begining
3. get all chunks for a document, used to be hard coded 10000
4. delete not used method run_graphrag

### Type of change

- [x] New Feature (non-breaking change which adds functionality)
- [x] Refactoring

Follow on: #14617

web/src/interfaces/database/dataset.ts

@@ -89,6 +89,7 @@ interface Parentchild {
 }
 
 interface Graphrag {
+  batch_chunk_token_size?: number;
   entity_types: string[];
   method: string;
   use_graphrag: boolean;

web/src/interfaces/database/document.ts

@@ -67,6 +67,7 @@ interface Raptor {
 }
 
 interface GraphRag {
+  batch_chunk_token_size?: number;
   community?: boolean;
   entity_types?: string[];
   method?: string;